| NOUN | substance | actinon, actinoid, actinide | any of a series of radioactive elements with atomic numbers 89 through 103 |
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| Meaning | Any of a series of radioactive elements with atomic numbers 89 through 103. | |
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| Synonyms | actinoid, actinide | |
| Broader | group, grouping | Any number of entities (members) considered as a unit |
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